Free groceries To attract shoppers, a supermarket runsa weekly contest that involves “scratch-off” cards. Witheach purchase, customers get a card with a black spotobscuring a message. When the spot is scratched away,most of the cards simply say, “Sorry—please try again.” But during the week, 100 customers will get cards thatmake them eligible for a drawing for free groceries. Tenof the cards say they may be worth $200, 10 others say$100, 20 may be worth $50, and the rest could be worth$20. To register those cards, customers write their nameson them and put them in a barrel at the front of the store.At the end of the week the store manager draws cards atrandom, awarding the lucky customers free groceries in the amount specified on their card. The drawings con-tinue until the store has given away more than $500 of free groceries. Estimate the average number of winnerseach week.
Free groceries To attract shoppers, a supermarket runsa weekly contest that involves “scratch-off” cards. Witheach purchase, customers get a card with a black spotobscuring a message. When the spot is scratched away,most of the cards simply say, “Sorry—please try again.” But during the week, 100 customers will get cards thatmake them eligible for a drawing for free groceries. Tenof the cards say they may be worth $200, 10 others say$100, 20 may be worth $50, and the rest could be worth$20. To register those cards, customers write their nameson them and put them in a barrel at the front of the store.At the end of the week the store manager draws cards atrandom, awarding the lucky customers free groceries in the amount specified on their card. The drawings con-tinue until the store has given away more than $500 of free groceries. Estimate the average number of winnerseach week.
Chapter9: Sequences, Probability And Counting Theory
Section9.5: Counting Principles
Problem 42SE: In horse racing, a “trifecta” occurs when a bettor wins by selecting the first three finishers in...
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Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
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Free groceries To attract shoppers, a supermarket runs
a weekly contest that involves “scratch-off” cards. With
each purchase, customers get a card with a black spot
obscuring a message. When the spot is scratched away,
most of the cards simply say, “Sorry—please try again.”
But during the week, 100 customers will get cards that
make them eligible for a drawing for free groceries. Ten
of the cards say they may be worth $200, 10 others say
$100, 20 may be worth $50, and the rest could be worth
$20. To register those cards, customers write their names
on them and put them in a barrel at the front of the store.
At the end of the week the store manager draws cards at
random, awarding the lucky customers free groceries in
make them eligible for a drawing for free groceries. Ten
of the cards say they may be worth $200, 10 others say
$100, 20 may be worth $50, and the rest could be worth
$20. To register those cards, customers write their names
on them and put them in a barrel at the front of the store.
At the end of the week the store manager draws cards at
random, awarding the lucky customers free groceries in
the amount specified on their card. The drawings con-
tinue until the store has given away more than $500 of
tinue until the store has given away more than $500 of
free groceries. Estimate the average number of winners
each week.
each week.
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